Dedupe Excercise

Author: Della-Bella

Sprint-1/implement/dedupe.js

@@ -1 +1,13 @@
-function dedupe() {}
+function dedupe(arr) {
+  let result = [];
+  for (let item of arr) {
+    if (!result.includes(item)) {
+      result.push(item);
+    }
+  }
+  return result;
+}
+
+console.log(dedupe(["a", "a", "a", "b", "b", "c"]));
+
+module.exports = dedupe;

Sprint-1/implement/dedupe.test.js

@@ -16,12 +16,26 @@ E.g. dedupe([1, 2, 1]) target output: [1, 2]
 // Given an empty array
 // When passed to the dedupe function
 // Then it should return an empty array
-test.todo("given an empty array, it returns an empty array");
+test("dedupe an empty array returns an empty array", () =>{
+    const inputEmpty = [];
+    const result = dedupe(inputEmpty);
+    expect(result).toEqual([]);
+});
 
 // Given an array with no duplicates
 // When passed to the dedupe function
 // Then it should return a copy of the original array
+test(" Given an array with no duplicates", () => {
+  const inputNoDuplicates = ["a", "b", "c" ];
+  const result = dedupe(inputNoDuplicates);
+  expect(result).toEqual(["a", "b", "c"]);
+});
 
 // Given an array with strings or numbers
 // When passed to the dedupe function
 // Then it should remove the duplicate values, preserving the first occurence of each element
+test(" Given an array with no duplicates", () => {
+  const inputMix = [1,1,2,2,3,3,4,4,5,5];
+  const result = dedupe(inputMix);
+  expect(result).toEqual([1,2,3,4,5]);
+});